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Cement grinding aids and theory

Views:3     Author:Maia     Publish Time: 2021-03-24      Origin:https://baike.baidu.com/item/%E6%B0%B4%E6%B3%A5%E5%8A%A9%E7%A3%A8%E5%89%82 Inquire

In the grinding process of cement clinkers,Add a small amount of an external substance (a liquid or solid substance),Can significantly improve grinding efficiency or reduce energy consumption, and does not damage the performance of the cement of this chemical additive additive material known as: cement grinding aid.

Cement grinding aid is a kind of chemical additive to improve the grinding effect and performance of cement, which can significantly increase the yield of cement, the strength of cement at all ages and improve its fluidity. Cement grinding aid can greatly reduce the phenomenon of electrostatic adsorption and ball encapsulation in the process of grinding, and can reduce the tendency of superfine particles agglomeration again in the process of grinding.

The cement grinding aid can also significantly improve the fluidity of cement, improve the grinding effect of the mill and the sorting efficiency of the powder sorting machine, thus reducing the energy consumption of grinding. The cement produced with grinding aid has a lower tendency of compaction and coalesce, which is conducive to the loading and unloading of cement and can reduce the phenomenon of hanging on the wall of cement storage. As a chemical additive, the grinding aid can improve the distribution of cement particles and stimulate the hydration force, thus increasing the early and late strength of cement.

THEORY

The first is that the adsorption of the abrasive aid molecules on the particles reduces the surface energy of the particles or causes the dislocation migration of the crystals near the surface layer, resulting in defects of points or lines, thereby reducing the strength and hardness of the particles and promoting the generation and expansion of cracks.

The second is that the grinding aid reduces the viscosity of the ore by regulating the fluidity of the ore material and the surface electrical property of the particle, and promotes the dispersion of the particle, so as to improve the fluidity of the ore material, and prevent the adhesion of the particle in the grinding medium and the lining plate of the mill as well as the agglomeration between the particles


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